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docs-java/process/maintenance/optimize/jvm/openj9.md

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+---
+sidebar_position: 7
+title: OpenJ9
+slug: /optimize/jvm/openj9
+---
+
+# OpenJ9
+
+这些参数只适合 OpenJ9
+
+## 基础
+
+```shell
+-XX:+IdleTuningGcOnIdle -XX:+UseAggressiveHeapShrink -XX:-OmitStackTraceInFastThrow -XX:+UseFastAccessorMethods -XX:+OptimizeStringConcat -Xshareclasses:allowClasspaths -Xshareclasses:cacheDir=./cache -Xaot -XX:+UseCompressedOops -XX:ObjectAlignmentInBytes=256 -Xshareclasses -XX:SharedCacheHardLimit=800M -Xtune:virtualized -XX:+TieredCompilation -XX:InitialTenuringThreshold=5 -Dlog4j2.formatMsgNoLookups=true -XX:-DisableExplicitGC -XX:InitiatingHeapOccupancyPercent=35 -XX:+UnlockExperimentalVMOptions -XX:MaxGCPauseMillis=6 -Djava.net.preferIPv4Stack=true -XX:-ParallelRefProcEnabled-XX:+UseTLAB -XX:ReservedCodeCacheSize=70M -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20
+```
+
+## GC
+
+考虑到 ZGC 通常会使用更多的内存,所以推荐使用 G1GC
+
+```shell
+-XX:+UseG1GC -XX:MaxGCPauseMillis=130 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=28 -XX:G1HeapRegionSize=16M -XX:G1ReservePercent=20 -XX:G1MixedGCCountTarget=3 -XX:InitiatingHeapOccupancyPercent=10 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=0 -XX:SurvivorRatio=32 -XX:MaxTenuringThreshold=1 -XX:G1SATBBufferEnqueueingThresholdPercent=30 -XX:G1ConcMarkStepDurationMillis=5.0 -XX:G1ConcRefinementServiceIntervalMillis=150 -XX:G1ConcRSHotCardLimit=16
+```